18 books in series

Sigma Force

Sigma Force is a 25-book series with 18 released primary works first released in 2004 with contributions by James Rollins and Steve Berry.

#1
Sandstorm

#1 of 18 in Sigma Force

2004 • 143 Readers • 736 pages • 3.7

#2
Map of Bones

#2 of 18 in Sigma Force

2004 • 91 Readers • 560 pages • 4.1

#2.5
Cover 6

#2.5 of 18 in Sigma Force

2006 • 2 Readers • 400 pages • 4

#3
Black Order

#3 of 18 in Sigma Force

2006 • 66 Readers • 421 pages • 4.1

#4
The Judas Strain

#4 of 18 in Sigma Force

2007 • 62 Readers • 4.1

#5
The Last Oracle

#5 of 18 in Sigma Force

2008 • 57 Readers • 4.2

#6
The Doomsday Key

#6 of 18 in Sigma Force

2009 • 49 Readers • 3.8

#6.5
Cover 4

#6.5 of 18 in Sigma Force

2011 • 28 Readers • 48 pages • 3.8

#7
The Devil Colony

#7 of 18 in Sigma Force

2011 • 46 Readers • 3.9

#7.5
Tracker

#7.5 of 18 in Sigma Force

2012 • 24 Readers • 67 pages • 4.1

#8
Bloodline

#8 of 18 in Sigma Force

2012 • 52 Readers • 4.1

#9
The Eye of God

#9 of 18 in Sigma Force

2013 • 47 Readers • 4.1

#9.5
Cover 4

#9.5 of 19 in Cotton Malone

2014 • 2 Readers • 4

#10
The 6th Extinction

#10 of 18 in Sigma Force

2014 • 38 Readers • 608 pages • 4

#10.5
Cover 1

#10.5 of 18 in Sigma Force

2015 • 13 Readers • 59 pages • 4

#11
The Bone Labyrinth

#11 of 18 in Sigma Force

2015 • 53 Readers • 688 pages • 4

#11.5
Cover 5

#11.5 of 18 in Sigma Force

2016 • 15 Readers • 54 pages • 3.7

#12
The Seventh Plague

#12 of 18 in Sigma Force

2016 • 38 Readers • 448 pages • 3.9

#12.5
Cover 1

#12.5 of 18 in Sigma Force

2017 • 13 Readers • 56 pages • 3.8

#13
The Demon Crown

#13 of 18 in Sigma Force

2017 • 37 Readers • 448 pages • 4.2

#14
Crucible

#14 of 18 in Sigma Force

2019 • 36 Readers • 4

#15
The Last Odyssey

#15 of 18 in Sigma Force

2020 • 32 Readers • 624 pages • 4.1

#16
Kingdom of Bones

#16 of 18 in Sigma Force

2021 • 31 Readers • 448 pages • 3.7

#17
Tides of Fire

#17 of 18 in Sigma Force

2023 • 22 Readers • 448 pages • 4.4

#18
Arkangel

#18 of 18 in Sigma Force

2024 • 17 Readers • 672 pages • 12h • 4.8